As far as shooters go, Triggerheart Exelica has a good little mechanic going with the anchor and there aren't a lot of this kind of shooters on the XBLA. Unfortunately, the very limited nature of the game, as well as its price, will in the end most likely be its undoing. Namely because it almost solely appeals to high score and achievement chasers. Still, fans of the genre might get a kick as they wait for something more prominent. PALGN will admit, they did enjoy the game, but the price doesn't quite seem right.
Overall: Triggerheart: Exelica is a good little shooter that's held back by a lack of value for anyone other than the hardcore.